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Finding the Fourth Proportional to 255,933.60, 383,929.20 and 78,439.20

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Solution

The fourth proportional to 255,933.60, 383,929.20 and 78,439.20 is: 117,667.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,933.60 : 383,929.20 = 78,439.20 : x
  2. Step 2: Convert to fraction form
    255,933.60/383,929.20 = 78,439.20/x
  3. Step 3: Cross multiply
    255,933.60x = 383,929.20 × 78,439.20
  4. Step 4: Simplify right side
    255,933.60x = 30,115,099,304.64
  5. Step 5: Solve for x
    x = 30,115,099,304.64/255,933.60
  6. Step 6: Final answer
    x = 117,667.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.